Piyachon P. Professor Emeritus Chaleow Piyachon (1938-2023) was a scholar, an active citizen and an active member. ASEAN J Radiol [Internet]. 2023 Dec. 31 [cited 2024 Nov. 22];24(3):345-8. Available from: https://asean-journal-radiology.org/index.php/ajr/article/view/889